It's had been built about since 1958.
<em>That mnemonic is some variation of</em>
<em>My Very Energetic Mother Just Served Us Nine Pizzas</em>
<em>- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.</em>
<em />
<em>Hope it can help !!!!</em>
<span>Properties of light, that define it as a wave is :
Wavelength
Amplitude
Period
Frequency
Speed
Hope this helps!</span>
